/* Quatvn XXX — video dọc kiểu TikTok */
:root{--bg:#000;--bg2:#121212;--bg3:#1f1f1f;--line:#2a2a2a;--tx:#fff;--mu:#a6a6a6;--pk:#fe2c55;--cy:#25f4ee;--side:240px;--tab:56px;--top:52px;--safe-b:env(safe-area-inset-bottom,0px)}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
html.qv-lock,html.qv-lock body{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--tx);font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
body.is-feed{overflow:hidden;height:100dvh}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;padding:0}
img{max-width:100%;display:block}
h1,h2,h3,h4{margin:0;line-height:1.3}
.ico{width:24px;height:24px;flex:none}
[hidden]{display:none!important}

/* Logo */
.logo{display:inline-flex;align-items:center;gap:7px;font-weight:800;font-size:20px;letter-spacing:-.3px;margin:0}
.logo a{display:inline-flex;align-items:center;gap:7px}
.logo__icon{width:30px;height:30px;flex:none}
.logo__b{color:var(--pk);font-size:13px;font-weight:800;border:1.5px solid var(--pk);border-radius:5px;padding:0 4px;line-height:1.35}

/* Ô tìm kiếm */
.search{display:flex;align-items:center;background:var(--bg3);border-radius:999px;padding:0 6px 0 16px;height:42px}
.search input{flex:1;min-width:0;background:none;border:0;color:var(--tx);font:inherit;outline:0;height:100%}
.search input::placeholder{color:var(--mu)}
.search button{width:36px;height:36px;display:grid;place-items:center;color:var(--mu)}
.search--big{margin:0 12px 16px}

/* Sidebar (máy tính) */
.side{display:none}
@media (min-width:1024px){
  .side{display:flex;flex-direction:column;gap:14px;position:fixed;inset:0 auto 0 0;width:var(--side);padding:18px 14px;border-right:1px solid var(--line);background:var(--bg);overflow-y:auto;z-index:30}
  .side__nav{display:flex;flex-direction:column;gap:2px;margin-top:4px}
  .side__link{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:8px;font-weight:700;font-size:17px}
  .side__link:hover{background:var(--bg3)}
  .side__link.is-on{color:var(--pk)}
  .side__copy{color:#666;font-size:12px;margin:auto 0 0}
}
.side__h{color:var(--mu);font-size:13px;font-weight:600;margin:10px 0 0;padding-top:12px;border-top:1px solid var(--line)}
.side__tags{display:flex;flex-wrap:wrap;gap:6px}
.side__tags a{font-size:13px;padding:4px 10px;border:1px solid var(--line);border-radius:999px;color:#ddd}
.side__tags a:hover{border-color:var(--pk);color:#fff}
.side__about{display:flex;align-items:center;gap:8px;color:var(--mu);font-size:13px;text-align:left}
.side__about .ico{width:18px;height:18px}

/* Thanh trên (mobile) */
.top{position:fixed;top:0;left:0;right:0;height:var(--top);display:flex;align-items:center;justify-content:space-between;padding:0 6px;z-index:25;padding-top:env(safe-area-inset-top,0px)}
.top__btn{width:44px;height:44px;display:grid;place-items:center}
.top__left{display:flex;align-items:center;min-width:0}
.top .logo{font-size:17px;gap:5px;text-shadow:0 1px 3px rgba(0,0,0,.6)}
.top .logo__icon{width:24px;height:24px}
.top .logo__b{font-size:11px}
@media (max-width:389px){.top .logo__b{display:none}}
.top__tabs{display:flex;gap:16px;font-weight:700;font-size:15px;margin-left:auto;margin-right:4px}
.top__tabs a{color:rgba(255,255,255,.6);padding:6px 0;position:relative;text-shadow:0 1px 3px rgba(0,0,0,.6)}
.top__tabs a.is-on{color:#fff}
.top__tabs a.is-on::after{content:"";position:absolute;left:50%;bottom:0;width:26px;height:3px;margin-left:-13px;background:#fff;border-radius:2px}
.is-feed .top{background:linear-gradient(rgba(0,0,0,.55),transparent)}
.is-grid .top{background:var(--bg);border-bottom:1px solid var(--line)}
.top .ico{filter:drop-shadow(0 1px 2px rgba(0,0,0,.6))}
@media (min-width:1024px){.top{display:none}}

/* Thanh tab dưới (mobile) */
.tabbar{position:fixed;left:0;right:0;bottom:0;height:calc(var(--tab) + var(--safe-b));padding-bottom:var(--safe-b);display:flex;background:var(--bg);border-top:1px solid #1c1c1c;z-index:25}
.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;font-size:11px;color:var(--mu)}
.tabbar a.is-on{color:#fff}
.tabbar .ico{width:25px;height:25px}
@media (min-width:1024px){.tabbar{display:none}}

/* ------------------------------------------------------------------ Feed */
.feed{position:fixed;top:0;left:0;right:0;bottom:calc(var(--tab) + var(--safe-b));overflow-y:scroll;scroll-snap-type:y mandatory;overscroll-behavior-y:contain;scrollbar-width:none;margin:0}
.feed::-webkit-scrollbar{display:none}
@media (min-width:1024px){.feed{left:var(--side);bottom:0}}
.slide{position:relative;height:100%;scroll-snap-align:start;scroll-snap-stop:always;overflow:hidden;background:#000}
.slide__bg{position:absolute;inset:-40px;background:#111 center/cover no-repeat;filter:blur(30px) brightness(.42) saturate(1.2);transform:scale(1.1)}
.slide__stage{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--top) 0 120px}
.slide__media{position:relative;width:100%;aspect-ratio:16/9;background:#000;box-shadow:0 10px 40px rgba(0,0,0,.5)}
.slide__frame{position:absolute;inset:0;overflow:hidden}
.slide__frame iframe,.slide__frame video{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000;z-index:2}
.slide__poster{width:100%;height:100%;object-fit:cover}
.slide__play{position:absolute;left:50%;top:50%;width:68px;height:68px;margin:-34px 0 0 -34px;border-radius:50%;background:rgba(0,0,0,.45);display:grid;place-items:center;backdrop-filter:blur(4px)}
.slide__play .ico{width:38px;height:38px;margin-left:4px}
.slide__dur{position:absolute;right:8px;bottom:8px;font-size:12px;font-weight:600;background:rgba(0,0,0,.7);padding:1px 6px;border-radius:4px}
.slide__empty{position:absolute;inset:auto 0 0;margin:0;padding:10px;text-align:center;background:rgba(0,0,0,.65);font-size:14px}
.is-playing .slide__play,.is-playing .slide__dur{display:none}
.servers{display:none}

.slide__info{position:absolute;left:12px;right:84px;bottom:14px;z-index:3;text-shadow:0 1px 3px rgba(0,0,0,.7)}
.slide__user{display:inline-flex;align-items:center;gap:5px;font-weight:700;font-size:16px}
.slide__tick{display:inline-grid;place-items:center;width:15px;height:15px;border-radius:50%;background:var(--cy);color:#000;font-size:10px;text-shadow:none}
.slide__title{font-size:15px;font-weight:500;margin:4px 0 2px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.slide.is-first h1.slide__title{-webkit-line-clamp:3}
.slide__meta{margin:0;font-size:12.5px;color:rgba(255,255,255,.78);display:flex;flex-wrap:wrap;gap:0 10px}
.slide__q{color:var(--cy);font-weight:700}
.slide__tags{margin:3px 0 0;display:flex;flex-wrap:wrap;gap:0 10px;font-size:14px;font-weight:700}
.slide__more{margin-top:6px;font-size:13.5px;max-height:38dvh;overflow-y:auto}
.slide__more summary{cursor:pointer;font-weight:700;color:#fff;list-style:none}
.slide__more summary::-webkit-details-marker{display:none}
.slide__more[open]{background:rgba(0,0,0,.6);border-radius:10px;padding:8px 10px;text-shadow:none}
.slide__desc{margin:6px 0;color:#ddd}
.slide__row{margin:4px 0;color:#ddd}
.slide__row a{margin-right:8px;color:#fff;text-decoration:underline;text-underline-offset:2px}

.slide__rail{position:absolute;right:6px;bottom:24px;z-index:3;display:flex;flex-direction:column;gap:16px;align-items:center}
.rail{display:flex;flex-direction:column;align-items:center;gap:3px;font-size:11.5px;font-weight:600;text-shadow:0 1px 3px rgba(0,0,0,.7);width:64px}
.rail .ico{width:46px;height:46px;padding:10px;border-radius:50%;background:rgba(255,255,255,.14);backdrop-filter:blur(6px)}
.rail--like.is-on .ico{color:var(--pk)}
.rail--like.is-on .ico{animation:qv-pop .35s}
@keyframes qv-pop{50%{transform:scale(1.25)}}

.feed__more{display:block;text-align:center;padding:30px;color:var(--mu)}
.feed__nav{display:none}

@media (min-width:1024px){
  .slide__stage{padding:28px 120px 150px 40px}
  .slide__media{width:min(100%,calc((100dvh - 180px) * 16 / 9));border-radius:12px;overflow:hidden}
  .slide__info{left:40px;right:140px;bottom:24px;max-width:760px}
  .slide__title{font-size:17px}
  .slide__rail{right:96px;bottom:auto;top:50%;transform:translateY(-50%)}
  .feed__nav{display:flex;flex-direction:column;gap:12px;position:fixed;right:28px;bottom:28px;z-index:20}
  .feed__nav button{width:46px;height:46px;border-radius:50%;background:var(--bg3);display:grid;place-items:center}
  .feed__nav button:hover{background:#333}
  .feed__nav svg{width:26px;height:26px}
}

/* ------------------------------------------------------------------ Trang lưới (thể loại, tìm kiếm, khám phá) */
.page{padding:calc(var(--top) + 10px) 0 calc(var(--tab) + var(--safe-b) + 16px);min-height:100dvh}
@media (min-width:1024px){.page{margin-left:var(--side);padding:28px 32px 40px}}
.sect{padding:6px 12px 14px}
.sect__title{font-size:22px;font-weight:800}
.sect__sub{margin:2px 0 0;color:var(--mu);font-size:14px}
.sub{font-size:17px;font-weight:700;margin:18px 12px 10px}
.desc{padding:0 12px 14px;color:#ccc;font-size:14px}
.empty{padding:30px 12px;color:var(--mu);text-align:center}
.vgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px}
@media (min-width:640px){.vgrid{grid-template-columns:repeat(4,1fr)}}
@media (min-width:1024px){.vgrid{grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:18px 14px;padding:0 12px}}
.vc__thumb{position:relative;display:block;aspect-ratio:9/16;background:var(--bg3);overflow:hidden}
@media (min-width:1024px){.vc__thumb{border-radius:8px}}
.vc__thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.vc__thumb:hover img{transform:scale(1.04)}
.vc__thumb::after{content:"";position:absolute;inset:auto 0 0;height:40%;background:linear-gradient(transparent,rgba(0,0,0,.7))}
.vc__dur{position:absolute;top:6px;right:6px;z-index:1;font-size:11px;font-weight:600;background:rgba(0,0,0,.6);padding:0 5px;border-radius:3px}
.vc__views{position:absolute;left:6px;bottom:6px;z-index:1;display:flex;align-items:center;gap:2px;font-size:12.5px;font-weight:700}
.vc__views .ico{width:16px;height:16px}
.vc__title{font-size:12px;font-weight:500;padding:4px 4px 8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:#ddd}
@media (min-width:1024px){.vc__title{font-size:14px;padding:6px 0 0}}
.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0 12px}
.chip{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:999px;background:var(--bg3);font-size:14px;font-weight:600}
.chip small{color:var(--mu);font-weight:400}
.chip:hover{background:#2c2c2c}
.pager{display:flex;flex-wrap:wrap;justify-content:center;gap:6px;padding:24px 12px}
.pager a,.pager span{min-width:40px;height:40px;display:grid;place-items:center;padding:0 12px;border-radius:8px;background:var(--bg3);font-weight:600;font-size:14px}
.pager .is-cur{background:var(--pk)}
.pager .pager__gap{background:none}
.ftr{padding:24px 12px 8px;color:#777;font-size:13px;border-top:1px solid var(--line);margin-top:24px}
.ftr__copy{margin:4px 0 0}

/* ------------------------------------------------------------------ Menu mobile: rộng 80%, nền đen mờ, bấm nền để đóng */
.drawer{position:fixed;inset:0;z-index:60;visibility:hidden}
.drawer.is-open{visibility:visible}
.drawer__mist{position:absolute;inset:0;background:rgba(0,0,0,.6);opacity:0;transition:opacity .25s}
.drawer.is-open .drawer__mist{opacity:1}
.drawer__box{position:absolute;top:0;bottom:0;left:0;width:80%;max-width:360px;background:var(--bg2);padding:14px 16px 24px;overflow-y:auto;transform:translateX(-100%);transition:transform .25s;display:flex;flex-direction:column;gap:12px}
.drawer.is-open .drawer__box{transform:none}
.drawer__head{display:flex;align-items:center;justify-content:space-between}
.drawer__x{font-size:30px;width:40px;height:40px;line-height:1}
.drawer__link{display:flex;align-items:center;gap:12px;padding:8px 2px;font-weight:700;font-size:16px}

/* ------------------------------------------------------------------ Khung giới thiệu */
.sheet{position:fixed;inset:0;z-index:55;visibility:hidden}
.sheet.is-open{visibility:visible}
.sheet__mist{position:absolute;inset:0;background:rgba(0,0,0,.6);opacity:0;transition:opacity .25s}
.sheet.is-open .sheet__mist{opacity:1}
.sheet__box{position:absolute;left:0;right:0;bottom:0;max-height:82dvh;overflow-y:auto;background:var(--bg2);border-radius:16px 16px 0 0;padding:18px 18px calc(24px + var(--safe-b));transform:translateY(100%);transition:transform .28s}
.sheet.is-open .sheet__box{transform:none}
@media (min-width:1024px){.sheet__box{left:50%;right:auto;bottom:auto;top:50%;width:680px;max-height:84dvh;border-radius:16px;transform:translate(-50%,-40%);opacity:0;transition:.25s}.sheet.is-open .sheet__box{transform:translate(-50%,-50%);opacity:1}}
.sheet__x{position:sticky;top:0;float:right;font-size:28px;width:36px;height:36px;line-height:1}
.seo{color:#ccc;font-size:14.5px}
.seo h2{color:#fff;font-size:20px;margin:0 0 10px}
.seo h3{color:#fff;font-size:16px;margin:18px 0 6px}
.seo h4{color:#eee;font-size:14.5px;margin:12px 0 2px}
.seo p{margin:6px 0}
.seo a{color:var(--cy)}
.seo ul,.seo ol{padding-left:20px;margin:6px 0}

/* ------------------------------------------------------------------ Xác nhận 18+ */
.gate{position:fixed;inset:0;z-index:90;background:rgba(0,0,0,.9);backdrop-filter:blur(12px);display:grid;place-items:center;padding:20px}
.gate__box{max-width:380px;text-align:center;background:var(--bg2);border-radius:16px;padding:26px 22px}
.gate__t{font-size:19px;font-weight:800;margin:14px 0 6px}
.gate__box p{color:#bbb;font-size:14px}
.gate__ok{display:block;width:100%;margin-top:16px;background:var(--pk);border-radius:8px;padding:12px;font-weight:700;font-size:16px}
.gate__no{display:inline-block;margin-top:12px;color:var(--mu);font-size:14px}

.toast{position:fixed;left:50%;top:40%;transform:translateX(-50%);background:rgba(40,40,40,.92);padding:10px 18px;border-radius:8px;font-size:14px;z-index:95}

/* Mobile: ảnh bìa phủ kín màn hình khi chưa phát (anh duyệt 29/10). Quay về ảnh ngang = xoá khối này. */
@media (max-width:1023px){
  .slide:not(.is-playing) .slide__stage{padding:0}
  .slide:not(.is-playing) .slide__media{position:absolute;inset:0;width:auto;aspect-ratio:auto;box-shadow:none}
  .slide:not(.is-playing) .slide__media::after{content:"";position:absolute;inset:auto 0 0;height:45%;background:linear-gradient(transparent,rgba(0,0,0,.75));pointer-events:none}
  .slide:not(.is-playing) .slide__dur{top:calc(var(--top) + 8px);bottom:auto}
}

/* ------------------------------------------------------------------ Nút + caption kiểu TikTok (1.1.0) */
.slide__rail{gap:14px;right:4px;bottom:14px}
.rail{width:58px;gap:1px;font-size:12.5px;font-weight:700}
.rail .ico{width:38px;height:38px;padding:0;background:none;backdrop-filter:none;border-radius:0;filter:drop-shadow(0 1px 2px rgba(0,0,0,.5))}
.rail b{font-weight:700}
.rail--like.is-on .ico{color:var(--pk)}
.rail--save.is-on .ico{color:#fbbf24;animation:qv-pop .35s}
.rail--src .ico{width:30px;height:30px}
.rail__av{position:relative;width:48px;height:48px;margin-bottom:12px}
.rail__av img{width:48px;height:48px;border-radius:50%;border:2px solid #fff;background:#000}
.rail__plus{position:absolute;left:50%;bottom:-10px;width:20px;height:20px;margin-left:-10px;border-radius:50%;background:var(--pk);color:#fff;font:700 17px/19px sans-serif;text-align:center}
.rail__disc{width:46px;height:46px;margin-top:4px;border-radius:50%;background:#222 center/cover no-repeat;border:9px solid #161616;box-shadow:0 0 0 1px #2c2c2c;animation:qv-spin 6s linear infinite}
@keyframes qv-spin{to{transform:rotate(360deg)}}

.slide__info{left:12px;right:78px;bottom:12px}
.slide__user{font-size:17px;font-weight:700}
.slide__cap{margin-top:3px;font-size:15px;line-height:1.38;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.slide__cap .slide__title,.slide.is-first h1.slide__title{display:inline;font-size:15px;font-weight:400;margin:0;-webkit-line-clamp:unset;overflow:visible}
.slide__tag{font-weight:700}
.slide__extra{display:none}
.slide__info.is-open .slide__cap{display:block;-webkit-line-clamp:unset;max-height:42dvh;overflow-y:auto;background:rgba(0,0,0,.35);border-radius:8px;padding:4px 6px;margin-left:-6px}
.slide__info.is-open .slide__extra{display:block;margin-top:6px}
.slide__morebtn{font-weight:700;font-size:15px;padding:0;text-shadow:0 1px 3px rgba(0,0,0,.7)}
.slide__more summary{display:none}
.slide__more{max-height:none;overflow:visible;margin-top:4px}
.slide__more:not([open]) > :not(summary){display:block}
.slide__music{display:flex;align-items:center;gap:6px;margin:5px 0 0;font-size:14px;max-width:72%}
.slide__music .ico{width:16px;height:16px}
.slide__mq{overflow:hidden;white-space:nowrap;flex:1}
.slide__mq span{display:inline-block;padding-left:100%;animation:qv-mq 12s linear infinite}
@keyframes qv-mq{to{transform:translateX(-100%)}}
@media (min-width:1024px){.slide__info{right:200px}.slide__rail{right:96px}}

/* Thanh tab dưới kiểu TikTok */
.tabbar{background:#000;border-top:0}
.tabbar a{color:rgba(255,255,255,.62);font-size:10.5px}
.tabbar a.is-on{color:#fff;font-weight:700}
.tabbar .ico{width:26px;height:26px}
.tabbar .tabbar__plus{flex:1;display:grid;place-items:center}
.tabbar__plus span{display:block;width:44px;height:29px;border-radius:9px;background:#fff;color:#000;font:700 24px/29px sans-serif;text-align:center;box-shadow:-3.5px 0 0 var(--cy),3.5px 0 0 var(--pk)}
.top__tabs a{font-size:16.5px}

/* Khung bình luận */
.csheet{position:fixed;inset:0;z-index:58;visibility:hidden}
.csheet.is-open{visibility:visible}
.csheet__mist{position:absolute;inset:0;background:rgba(0,0,0,.35);opacity:0;transition:opacity .25s}
.csheet.is-open .csheet__mist{opacity:1}
.csheet__box{position:absolute;left:0;right:0;bottom:0;height:70dvh;display:flex;flex-direction:column;background:#161616;border-radius:14px 14px 0 0;transform:translateY(100%);transition:transform .28s;padding-bottom:var(--safe-b)}
.csheet.is-open .csheet__box{transform:none}
@media (min-width:1024px){.csheet__box{left:auto;right:0;top:0;height:auto;width:420px;border-radius:0;transform:translateX(100%)}}
.csheet__head{position:relative;text-align:center;font-size:13.5px;font-weight:700;padding:14px 40px 10px}
.csheet__x{position:absolute;right:8px;top:6px;width:36px;height:36px;font-size:26px;line-height:1}
.csheet__list{flex:1;overflow-y:auto;padding:4px 16px}
.cmt{display:flex;gap:12px;padding:9px 0}
.cmt__av{flex:none;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:700;background:linear-gradient(135deg,var(--pk),#7c3aed)}
.cmt p{margin:0}
.cmt__name{font-size:13px;color:#aaa;font-weight:600}
.cmt__text{font-size:15px;line-height:1.4;word-break:break-word}
.cmt__ago{font-size:12px;color:#777;margin-top:2px}
.cmt__empty{color:#888;text-align:center;padding:40px 0;margin:0}
.csheet__form{border-top:1px solid #262626;padding:8px 12px;display:flex;flex-direction:column;gap:6px}
.csheet__form input{background:#262626;border:0;border-radius:8px;color:#fff;font:inherit;font-size:15px;padding:9px 12px;outline:0;min-width:0}
.csheet__form input[name=name]{font-size:13px;padding:6px 12px;width:60%}
.csheet__row{display:flex;gap:8px}
.csheet__row input{flex:1}
.csheet__row button{background:var(--pk);border-radius:8px;padding:0 16px;font-weight:700}
.csheet__row button:disabled{opacity:.5}
.csheet__hp{position:absolute!important;left:-9999px;width:1px;height:1px;opacity:0}

/* Hồ sơ */
.prof{text-align:center;padding:10px 12px 0}
.prof__av{width:88px;height:88px;border-radius:50%;margin:0 auto 8px;border:2px solid #333}
.prof__name{font-size:19px;font-weight:800}
.prof__note{color:var(--mu);font-size:13px;margin:4px 0 12px}
.prof__tabs{display:flex;border-bottom:1px solid var(--line)}
.prof__tabs button{flex:1;display:flex;align-items:center;justify-content:center;gap:6px;padding:10px;color:var(--mu);font-weight:700;border-bottom:2px solid transparent}
.prof__tabs button.is-on{color:#fff;border-color:#fff}
.prof__tabs .ico{width:18px;height:18px}
.prof__list{padding-top:2px}